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(No Model.) v 4 V. W. BLANCHARD.

FURNAGE.

No. 413,922." Patented oct'. 29, 1889.

N, Plazas. mowmmpw, wnmnglm o c -UNITED STATES YPATENT OEEICE.

VIRGIL W. BLANCHARD, OF NEW YORK, N. Y., ASSIGNOR TO JOSEPH A.

DAVIS, OF SAME PLACE.

FU RNACE.

SPECIFICATION forming part of LettersPatent No. 413,922, dated October 29, 1889.

Application inea April 13, 1ss9.`

.To all whom it may concern.-

Be it known that I, VIRGIL W. BLANCHARD,

'of New York, in the county of New York and full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked 'thereon,which form part of this specification,

in which Figure 1 is an elevation of a furnace, partly in section, showing myv improved automatic pulverized-fuel feeder applied to it. Fig. 2 is a vertical section of the feeder.

, The lobject of this invention is to supply pulverized fuel in desired quantities to furnaces, and to regulate the supply according to the intensity of heat in the furnace andthe pressure of steam in a boiler used in connection therewith; and it consists in certain novel means whereby the aboveobject can be accomplished automatically and the steam in the boiler-maintained at any desired pressure, as will befully understood from thefollowing description,when taken in connection with the annexed drawings.

A designates ka furnace, the outlet from which should, communicate with a steamboiler casing inany suitable manner. y

B designates the ash-pit of this furnace; C, the grate, and Dthefuel-chamber, access to which may be had by means of adoor B', that should be hermetically closed during the operation of the furnace.

E 'designates a feeder for finely-pulverized fuel, with which feeder communicates a pipe F, leading to a suitable air-forcing engine and provided with a regulating-cock f. The feeder E consists of a cylinder H, in which is applied a rotary worm or screw conveyer J, applied on a shaft which has a' stepped conepulley K, keyed on one end, hereinafter again referred to. Into the cylinder H finely-pulverized fuel is fed from a hopper G, provided with 'a regulating-cock g', applied to the neck g of tl1is"hopper. At the lower end of the neck of' the hopper, or point of discharge thereof,'commences one end of the worm-con- Serial No. 307,157. (No model.)

veyer J, the oppositeend thereof terminating in the cylinder H,`just below the air-blast pipe F, and at the junction of a bifurcated pipe I-I with'the conveyer-cylinder H. The bifurcations H extend into the ash-pit B, and lie on the floor thereof, as shown in Fig. l. The said bifurcations are numerously perforated, as indicated at d d, and these perforations are all directed toward a passage 71 which forms acommunication between the ash-pit and the lump-fuel chamber D outside of the margin of the grate O.

c' is a removable block provided with a regu,- lating-slide and supported on the grate at the upper4 terminus of the passage h. ing this block c' the coal on the grate can be raked with a suitable instrument, and by means of the slide which is applied to this block the size of the discharge-throat of the passage h can be regulated.

When the coal lon the grate O is heated to a state of incandescence and the air-forcing engine and also the conveyer-worm are set in By removmotion, the cock g ofl the hopper Gr is more or less opened, and pulverizedfuel allowed to flow into the `cylinder H. The worm J will now feed the ne fuel beneath the blast-pipe F, where it is subjected to a strong blast of air, which forcibly injects this fuel through the perforated bifurcated pipe H into the ash-pit, and from thence through the passage h into the fuel-chamber D, either over or through the body of incandescent fuel on the grate C.

The foregoing parts of the apparatus are substantially shown and described in my ap'- plication, Serial No. 306,972, iiled April l2, 1889, for furnaces, and are not herein broadly .claimed vIn the passage of the strong currents of air mixed with the pulverized fuel through the ash-pit on their way to the fuel-chamber they will carry with them the ashes which fall through the grate and deposit them among the incandescent lumps of fuel, where they will be consumed. v

K designates a stepped cone-pulley, which is a duplicate of the pulley K on the shaft of the worm-conveyer J, and which receives the belt b. The pulley K is keyed on a shaft t, which is journaled in pillow-blocks mounted Y on a frame L, and which has also clutched on it a belt-drum N, that receives rotation from a belt wheel driven by an engine. (Not shown in the drawings.) This engine receives steam from the boiler, which is heated by the furnace A. On one end of the shaft t, I apply a sliding clutch P of any suitable kind, by adjusting which the pulley N can be caused to turn loosely on this shaft. The bifurcated end of a lever p engages with the sliding portion of the clutch P, and the opposite end of this lever is connected to one arm of a short lever r, which has its fulcrum on an extension of the frame of a steam-cylinder S. The opposite arm of lever r is pivoted to the piston-rod of a solidpiston working in said steamcylinder. The outer extremity of the pistonrod of piston T is pivoted to the short arm of a steelyard V, on which is applied an adjustable weight XV.

The steam-cylinder S receives its steam by means of a pipe c from the same boiler which is heated by the furnace A,and which drives the engine that supplies the air-blast to the pulverized fuel-feeder.

The operation of my apparatus is as follows: The belt b is adjusted on the cone-pulleys to transmit the desi-red speed to the conveyershaft, and valves f g are opened, pulverized fuel being supplied to the hopper G. The lever V is then loaded according to a predetermined pressure of steam in the boiler. Now, it will be observed that pulverized fuel will be fed into the furnace in regulated and desired quantities as long as the given pressure of steam in the boiler is maintained. Should, however, this pressure be increased, the piston T will be forced outward and the long arm of the loaded lever Vwill be caused to rise, thereby disengaging the clutch P from the belt-drum N and stopping the motion of the pulverized-fuel conveyer and the feed. This operation will have the effect of reducing the heat of the furnace and allowing the steam-pressure in the boiler to fall to the desired point. At the moment this takes place the weight YV will press back the piston T and cause the clutch P to engage beltwheel N with its shaft t again and start the fuel-feeder. It will thus be observed that the pulverized fuel will be automatically fed into the furnace, and that the operation of this feeder depends on the heat of the furnace and pressure of steam in the boiler heated by it.

The pulverized fuel will be supplied to the furnace faster or slower, according to the position of the belt b on thefcone-pulleys, and the fuelconveyer will be stopped or started according to the pressure of steam in the boiler and the amount of the weight acting to hold back the piston T in cylinder S.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. The combination, with the pulverizedfuel feeder and the blast-pipe, of the conepulleys, their belt, the belt-pulley, the clutch, and means for automatically actuating this clutch and starting or stopping the feed at certain determined pressures of steam, substantially as described.

2. The combination, with a furnace and a pulverized-fuel feeder, substantially as described, of the shafting and clutch connecting with said feeder, and the means for automatically operating this clutch to start or stop the feed at a certain predetermined pressure of steam, all as and for the purpose specified.

3. The combination of a furnace and a fuelfeeder therefor with the shaft driven by an engine and operating said feeder, the clutch engaging said shaft, and the devices, subst-antially as described, for automatically actuating said clutch to start or stop the feeder, all substantially as specified.

4f.v The combination of the fuel-feeder, substantially as described, the blast-pipe connecting therewith, the steam-cylinder, its weightcontrolled piston,and the connections between the same and the fuel-feeder, whereby the lat ter is automatically stopped or started at a certain boiler or steam pressure, substantially as and for the purpose described.

'5. In combination with a furnace, an automatic pulverized fuel feeder, an airblast, pulleys and belts for actuating the feeder, a clutching device, a steam-cylinder communieating with a boiler and provided with a piston loaded as described, and the connections between the piston-rod and said clutching device, substantially as specified.

6. The combination of the injecting-pipe and a conveyer-screw arranged therein, a fuel-feed hopper, the shafts and pulleys for driving said conveyer, and the automaticallyoperated clutch engaging one of said shafts, whereby the conveyer is stopped or started, substantially as and for the purpose set forth.

7. The combination of the injecting-pipe arranged in an ash-pit of a furnace below the grate, with a conveyer-screw applied in a cylinder outside of the furnace, a fuel-feed hopper, a blast-pipe communicating with said cylinder, and regulating-valves applied to the neck of the hopper and to the said blast-pipe, all substantially as and for the purpose described.

8. The combination, with a furnace, an automatic pulverized-fuel feeder, cone-pulleys and belts for operating said feeder, and the feed hopper and its valved neck, of the steam-cylinder, its piston, the weighted lever connected thereto, and the clutch on one of the cone-shafts, and the connections between said clutch and the piston, all constructed and arranged substantially as set forth.

9. The combination, with a furnace having an injecting-pipe below its grate, a casing connecting therewith, having a feed-hopper and a rotary screw conveyer in said casing,

IOO

IIO

413,922 v f s the cone-pulleys and belts, and the clutchingv4 device, of the air-blast pipe Valved as dcscribed and communicating with said casing,

, the steam-cylinder, its Weighted lever and pis-V ton, and theconnections between the piston and clutch, all constructed and arranged to operate for the purpose and in the manner specified.

In testimony thatvI claim the foregoing as my' own I aix my signature in presence of 1o two Witnesses.

VIRGIL W. BLANCHARD.

Witnesses:

ALEX. S. STEUART, P. L; BROOKS. 

